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I2041AF-08SR Arkusz danych(PDF) 3 Page - ON Semiconductor |
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I2041AF-08SR Arkusz danych(HTML) 3 Page - ON Semiconductor |
3 / 7 page P2041A http://onsemi.com 3 Table 3. SPREAD RANGE SELECTION SR1 SR0 Spreading Range Modulation rate 0 0 ±1.50% (Fin/40)*34.72 KHz 0 1 ±2.50% (Fin/40)*34.72 KHz 1 0 ±0.50% (Fin/40)*34.72 KHz 1 1 ±1.00% (Fin/40)*34.72 KHz Spread Spectrum Selection Table 3 illustrates the possible spread spectrum options. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center frequency (Note: The center frequency is the frequency of the external reference input on XIN / CLK, Pin 1). Example of a typical printer or scanner application that operates on a clock frequency of 40 MHz: A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of ±1.00%* (see Table 3) of Center Frequency. This results in the frequency on ModOUT being swept from 40.40 MHz to 39.60 MHz at a modulation rate of (40/40)*34.72 = 34.72 KHz (see Table 3). This particular example (see Figure below) given here is a common EMI reduction method for scanners and has already been implemented by most of the leading manufacturers. NOTE: Spreading range selection varies from different system manufacturers and their designs. The spreading range of P2041A can be set to ±2.5% when working with certain scanner model. Figure 2. P2041A Application Schematic for Flat−Bed Scanner 1 2 3 4 8 7 6 5 Modulated 40 MHz signal with ±1.00% Deviation and modulation rate of 34.72 KHz. This signal is connected back to the clock crystal Input pin of the system ASIC. Note: The above schematic indicates The exact setting of this example: Default set- ting (no connection on pin 3, 7 and 5). 40 MHz VDD P2041A 0.1 mF VSS SR1 XOUT XIN / CLK VDD SR0 ModOUT SSON |
Podobny numer części - I2041AF-08SR |
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Podobny opis - I2041AF-08SR |
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